Quote:
Originally Posted by G8HQP Dave
In the case of attenuators it will almost always be the case that X=0.
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Quite: it is the case when X is
not zero that I was referring to.
But I'll try to be more explicit . . . .
Source impedance = Za = Ra + jXa; Load impedance = Zb = Rb + jXb
where X can be +ve or -ve.
Source voltage = Va; load voltage = Vb. Required attenuation = k = Vb/Va.
So our 'knowns' are k, Za and Zb.
Between source and load we have a 'black box' which produces the required attenuation of k. That attenuation is not variable with frequency.
What are the equations that determine the configuration of the components and their values inside that 'black box' in terms of the 'knowns'?
Al.